class_docstr: Data structure holding a single PPI graph.
docstr: Initial node features as ndarray of shape [V, ...]
docstr_tok: ["Initial","node","features","as","ndarray","of","shape","[","V",",","...","]"]
code: def node_features(self) -> np.ndarray:
      """Initial node features as ndarray of shape [V, ...]"""
      return self._node_features
  
file_path: ptgnn/ptgnn/implementations/ppi/dataloader.py
imports: import numpy
  from dpu_utils.utils import RichPath
  from typing import Dict, List
label_desc: Use image node_id 4 for calling the PPIGraphSample obj's underlying member method code with example usage: obj.node_features() and returns: self